## Mosquito Bat without Battery

This simple homemade mosquito swatter bat neither requires a circuit nor a battery for the operation. The entire design works using a single high voltage capacitor and through quick charging from mains AC socket. (Designed by me) Introduction In a few of my earlier posts I have discussed how to make mosquito zappers using the … Read more

## Reactance Calculator

Calculate the reactance XC by selecting a preferred value of the capacitor C and the frequency f. Capacitive reactance (symbol XC) may be defined as a measure of a capacitor’s opposition to AC (alternating current). Quite similar to resistance, and therefore it is also measured in ohms. Howveer reactance can be a tad more complex … Read more

## Capacitance Calculator

Capacitive reactance is an opposition to the change of voltage across an element. Capacitive reactance XC is inversely proportional to the signal frequency f (or angular frequency ω) and the capacitance C. 1,000,000 pF = 1000 nF = 1 µF = 1 × 10−6 F   100,000 pF = 100 nF = 0.1 µF = 1 … Read more

## LM317 LM338 Calculator

This LM317, LM338 calculator software is used as a tool to determine the value of the voltage adjusting resistor needed to assign the output of an LM317 to an allocated degree. Normally R1 is 220 ohms or 240 ohms, however it could very well be a different value for instance 150 or 470 ohms. Go … Read more

## Patient Drip Empty Warning Indicator Circuit

In this post we will learn about a simple mechanism, and a circuit which will enable a patient’s IV drip bottle system to sound an alarm whenever it gets almost empty, and needs a replacement. The warning circuit will help doctors and the concerned employees to concentrate on other important matters while the drip systems … Read more

## What is Constant Current Source

In this post we try to analyze what is constant current source and how it affects a load, or how it may be used with a load correctly for achieving the most efficient results. The following discussion between me and Mr. Girish will clearly explain what is CC or how constant current operates. How a … Read more